Pulse Trains
Mostrando 1-12 de 58 artigos, teses e dissertações.
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1. Experimentos virtuales sobre una mosca vagabunda: más allá de la solución de Neumann
We extend the traditional problem of calculating the distance of travel of a fly that is moving with constant speed along a straight path between two trains that are approaching one another. We found two analytical solutions for the traditional problem and we propose a generalization to the accelerated motion of the trains through a simulation. With this pro
Rev. Bras. Ensino Fís.. Publicado em: 2013-06
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2. Copulatory courtship song in Lutzomyia migonei (Diptera: Psychodidae)
Lutzomyia migonei is a vector of leishmaniasis with a wide distribution in South America, which could favour population differentiation and speciation. Cryptic species of the Lutzomyia longipalpis complex, the widely distributed sand fly vector of visceral leishmaniasis in Latin America, have previously been shown to display distinct copulation songs. We fou
Memórias do Instituto Oswaldo Cruz. Publicado em: 2010-12
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3. Acumulo coerente de excitação na tranferencia eletromagneticamente induzida por um trem de pulsos ultracurtos / Coherent accumulation of excitation in the electromagnetically induced transparency by an ultrashort pulse train
Nesta tese apresentamos um estudo teórico da interação coerente entre trens de pulsos ultracurtos e sistemas atômicos simples de dois e três níveis, este último na configuração L. Primeiramente avaliamos a situação em que um trem de pulsos ultracurtos não só sonda um sistema de três níveis na configuração L, mas também leva o átomo à conf
Publicado em: 2009
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4. Espectroscopia não linear em cristais fluoretos e polianilina / Nonlinear spectroscopic characterization in fluoride crystals and polyaniline
In this work we studied the effect of nonlinear refraction in Cr+3 doped fluoride host crystals and polymers. The fluoride crystals have been attractive due a broad emission bandwidth and a tunable solid-state lasing in the range of approximately 780-1010 nm. Applying the Thermal Lens (TL) technique, we accomplished a quantitative study of the behavior of th
Publicado em: 2001
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5. Dynamic of optical nonlinearities in macromolecules and oligomers / Dinâmica de não linearidades ópticas em macromoléculas e oligômeros
This work reports the dynamic nonlinear optical properties of organic compounds, namely, ytterbium bis-phthalocyanine, furfuryl alcohol derivatives and azo-aromatic compounds. In order to carry out this investigation we developed an experimental extension to the standard Z-scan technique, named Z-scan with pulse trains. In this method, pulse trains contained
Publicado em: 2000
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6. ULTRA-SHORT OPTICAL PULSES GENERATION USING RATIONAL MODE-LOCKING IN FIBER LASERS / GERAÇÃO DE PULSOS ÓPTICOS ULTRACURTOS USANDO A TÉCNICA DE MODE-LOCKING RACIONAL EM LASERS A FIBRA
This work describes a simple and stable harmonically mode- locked erbium-doped fiber ring laser, that produces high power, ~ 1 ps transform-limited sech optical pulses. Pulse trains with different high repetition rates were obtained using harmonic mode-locking and rational harmonic mode- locking techniques. The temporal and spectral characteristics of the pu
Publicado em: 2000
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7. AUTOMATED SYSTEM FOR THE READING AND ANALYSIS OF STRUCTURAL MEASUREMENTS (S.A.L.A.M.E. PROJECT) - STUDY OF THE HARDWARE / SISTEMA AUTOMÁTICO DE LEITURA E ANÁLISE DE MEDIDAS ESTRUTURAIS (PROJETO S.A.L.A.M.E) - ESTUDO DO HARDWARE
The Structural Laboratory of the Civil Engineering Departament (EGG) is present involved in designing a system for the automation of the existing system. The system measures and characteristics by moans of interest on a structural model design. Tho transducers, linked to Wheatstone bridges, to induced structurals trains imposed upon the model being studied.
Publicado em: 1967
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8. Summation of rapid tactile stimuli in parietal lobe disease.
The perception threshold for trains of rapid tactile pulses, applied to the index finger, has been measured in patients with parietal lobe lesions and in patients with median nerve lesions. The former patients had increased perception thresholds for single tactile pulses on the abnormal side. With successively prolonged pulse trains, the threshold decreased
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9. Post-repolarization block of cardiac sodium channels by saxitoxin.
Phasic block of rat cardiac Na+ current by saxitoxin was assessed using pulse trains and two-pulse voltage clamp protocols, and the results were fit to several kinetic models. For brief depolarizations (5 to 50 ms) the depolarization duration did not affect the rate of development or the amplitude of phasic block for pulse trains. The pulse train data were w
The Biophysical Society.
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10. Interaural Time-Delay Sensitivity in Bilateral Cochlear Implant Users: Effects of Pulse Rate, Modulation Rate, and Place of Stimulation
Electrical interaural time delay (ITD) discrimination was measured using 300-ms bursts applied to binaural pitch matched electrodes at basal, mid, and apical locations in each ear. Six bilateral implant users, who had previously shown good ITD sensitivity at a pulse rate of 100 pulses per second (pps), were assessed. Thresholds were measured as a function of
Springer-Verlag.
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11. Regulation of the milk ejection reflex in the rat.
Extracellular recordings were made from neurones in or near the supraoptic nucleus in suckled lactating rats under urethane anaesthesia to investigate the mechanism by which the firing of oxytocin cells is synchronized during reflex milk ejection. Cells synaptically driven but not antidromically activated by neural stalk stimulation, which thus probably rece
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12. Factors affecting intracellular sodium during repetitive activity in isolated sheep Purkinje fibres.
1. Intracellular Na+ activity (aiNa) was measured using neutral-carrier Na+-sensitive micro-electrodes in voltage-clamped sheep Purkinje fibres during and after 4 min sequences of depolarizing pulses applied to around 0 mV, at a rate of 2.5 Hz. After trains of pulse duration 50 ms the mean increase in aiNa was 0.65 +/- 0.3 mM (mean +/- S.D., n = 18) whereas